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On-Base Percentage Calculator

On-base percentage (OBP): how often a batter reaches base via hits, walks or hit-by-pitch.

Also known as obp calculator, on base pct, reaching base rate.

Enter values

Results update as you type.

Result

OBP

0.367

Plate appearances
589
Times on base
216

About the On-Base Percentage Calculator

On-base percentage (OBP): how often a batter reaches base via hits, walks or hit-by-pitch.

Also known as: obp calculator, on base pct, reaching base rate.

How to use this calculator

  1. Enter hits, walks, hit by pitch, at-bats and the other fields.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

On-Base Percentage formula

OBP = (H + BB + HBP) ÷ (AB + BB + HBP + SF)

Worked example

Using the values pre-filled in the calculator above:

  • Hits = 152
  • Walks = 58
  • Hit by pitch = 6
  • At-bats = 520
  • Sacrifice flies = 5

the calculator returns:

  • OBP: 0.367
  • Plate appearances: 589
  • Times on base: 216